Metallurgical Characterization of Welded Joint of Nanostructured Bainite: Regeneration Technique versus Post Welding Heat Treatment
One of the main limitations in application of nanostructured carbide-free bainite as a construction material is the difficulty of joining. This research presents a structural characterization of welded joints of medium carbon 55Si7 grade steel after the welding process with a regeneration technique...
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MDPI AG
2020-10-01
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| Online Access: | https://www.mdpi.com/1996-1944/13/21/4841 |
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| author | Aleksandra Królicka Krzysztof Radwański Aleksandra Janik Paweł Kustroń Andrzej Ambroziak |
| author_facet | Aleksandra Królicka Krzysztof Radwański Aleksandra Janik Paweł Kustroń Andrzej Ambroziak |
| author_sort | Aleksandra Królicka |
| collection | DOAJ |
| description | One of the main limitations in application of nanostructured carbide-free bainite as a construction material is the difficulty of joining. This research presents a structural characterization of welded joints of medium carbon 55Si7 grade steel after the welding process with a regeneration technique as well as post welding heat treatment (PWHT). The hardness distribution of the welded joint with regeneration exhibit an overall decrease in hardness when compared to the base material and a significant decrease in hardness was observed in the heat-affected zone (HAZ). Unfavorable hardness distribution was caused by the presence of diffusion-type transformations products (pearlite) in the HAZ and bainite degradation processes. On the other hand, welding with the PWHT promotes the achievement of a comparable level of hardness and structure as in the base material. However, a slight decrease in hardness was observed in the weld zone due to the micro-segregation of the chemical composition caused by the indissoluble solidification structure. Based on the structural analysis, it was found that steel with relatively low hardenability (55Si7) should be welded using PWHT rather than a regeneration technique. |
| first_indexed | 2024-03-10T15:14:28Z |
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| id | doaj.art-ff5b910e32e04e57a17d8d528dff47b7 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T15:14:28Z |
| publishDate | 2020-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-ff5b910e32e04e57a17d8d528dff47b72023-11-20T19:04:29ZengMDPI AGMaterials1996-19442020-10-011321484110.3390/ma13214841Metallurgical Characterization of Welded Joint of Nanostructured Bainite: Regeneration Technique versus Post Welding Heat TreatmentAleksandra Królicka0Krzysztof Radwański1Aleksandra Janik2Paweł Kustroń3Andrzej Ambroziak4Department of Metal Forming, Welding and Metrology, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, PolandŁukasiewicz Research Network-Institute for Ferrous Metallurgy, K. Miarki 12-14, 44-100 Gliwice, PolandŁukasiewicz Research Network-Institute for Ferrous Metallurgy, K. Miarki 12-14, 44-100 Gliwice, PolandDepartment of Metal Forming, Welding and Metrology, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, PolandDepartment of Metal Forming, Welding and Metrology, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, PolandOne of the main limitations in application of nanostructured carbide-free bainite as a construction material is the difficulty of joining. This research presents a structural characterization of welded joints of medium carbon 55Si7 grade steel after the welding process with a regeneration technique as well as post welding heat treatment (PWHT). The hardness distribution of the welded joint with regeneration exhibit an overall decrease in hardness when compared to the base material and a significant decrease in hardness was observed in the heat-affected zone (HAZ). Unfavorable hardness distribution was caused by the presence of diffusion-type transformations products (pearlite) in the HAZ and bainite degradation processes. On the other hand, welding with the PWHT promotes the achievement of a comparable level of hardness and structure as in the base material. However, a slight decrease in hardness was observed in the weld zone due to the micro-segregation of the chemical composition caused by the indissoluble solidification structure. Based on the structural analysis, it was found that steel with relatively low hardenability (55Si7) should be welded using PWHT rather than a regeneration technique.https://www.mdpi.com/1996-1944/13/21/4841weldingregeneration techniquenanostructured bainitenanobainiteHAZfusion zone |
| spellingShingle | Aleksandra Królicka Krzysztof Radwański Aleksandra Janik Paweł Kustroń Andrzej Ambroziak Metallurgical Characterization of Welded Joint of Nanostructured Bainite: Regeneration Technique versus Post Welding Heat Treatment Materials welding regeneration technique nanostructured bainite nanobainite HAZ fusion zone |
| title | Metallurgical Characterization of Welded Joint of Nanostructured Bainite: Regeneration Technique versus Post Welding Heat Treatment |
| title_full | Metallurgical Characterization of Welded Joint of Nanostructured Bainite: Regeneration Technique versus Post Welding Heat Treatment |
| title_fullStr | Metallurgical Characterization of Welded Joint of Nanostructured Bainite: Regeneration Technique versus Post Welding Heat Treatment |
| title_full_unstemmed | Metallurgical Characterization of Welded Joint of Nanostructured Bainite: Regeneration Technique versus Post Welding Heat Treatment |
| title_short | Metallurgical Characterization of Welded Joint of Nanostructured Bainite: Regeneration Technique versus Post Welding Heat Treatment |
| title_sort | metallurgical characterization of welded joint of nanostructured bainite regeneration technique versus post welding heat treatment |
| topic | welding regeneration technique nanostructured bainite nanobainite HAZ fusion zone |
| url | https://www.mdpi.com/1996-1944/13/21/4841 |
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